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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda83878a342ae04772b2947f124a1f759b8ceeaf1101a9a715693b18b74f6b4' 
  AND token = 'mNRVBJUm4oLle7dLT0e8SgGkjpsTQJcs0a9pejYFzqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}